LXR uboot/arch/m68k/lib/lshrdi3.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * lshrdi3.c extracted from gcc-2.7.2.3/libgcc2.c and
   4 *                         gcc-2.7.2.3/longlong.h
   5 *
   6 * Copyright (C) 1989-2015 Free Software Foundation, Inc.
   7 */
   8
   9#define BITS_PER_UNIT 8
  10
  11typedef          int SItype     __attribute__ ((mode (SI)));
  12typedef unsigned int USItype    __attribute__ ((mode (SI)));
  13typedef          int DItype     __attribute__ ((mode (DI)));
  14typedef int word_type __attribute__ ((mode (__word__)));
  15
  16struct DIstruct {SItype high, low;};
  17
  18typedef union
  19{
  20  struct DIstruct s;
  21  DItype ll;
  22} DIunion;
  23
  24DItype __lshrdi3 (DItype u, word_type b)
  25{
  26        DIunion w;
  27        word_type bm;
  28        DIunion uu;
  29
  30        if (b == 0)
  31                return u;
  32
  33        uu.ll = u;
  34
  35        bm = (sizeof (SItype) * BITS_PER_UNIT) - b;
  36        if (bm <= 0)
  37        {
  38                w.s.high = 0;
  39                w.s.low = (USItype)uu.s.high >> -bm;
  40        }
  41        else
  42        {
  43                USItype carries = (USItype)uu.s.high << bm;
  44                w.s.high = (USItype)uu.s.high >> b;
  45                w.s.low = ((USItype)uu.s.low >> b) | carries;
  46        }
  47
  48        return w.ll;
  49}